Ex-NBA player Bo Kimble is pleading with Chris Bosh ... RETIRE IMMEDIATELY ... saying he doesn't want to see Bosh die on the court like his friend and college teammate Hank Gathers.
The Heat shut Bosh down on February 9th when the clotting issues that ended his '14-'15 season returned ... this time showing up in his calf.
Bosh is reportedly unhappy with the decision ... and feels he's healthy enough to resume his playing career.
Kimble -- who was present when Hank Gathers died during a college game in 1990 -- thinks returning to the league is a bad idea for Bosh.